Call mvn install in project root, then run mvn spring-boot:run to start the application.
This assumes that port 8080 is open.
It is then possible to see the exposed API with Swagger at http://localhost:8080/swagger-ui.html if desired.
From the todo-frontend directory, run npm install and npm start. This assumes that port 3000 is open.
A browser window should then open to http://localhost:3000 which shows the application.
Note that this is merely a development configuration and is not intended to reflect methods used to run production code.